The department has employed age-progressed DNA phenotyping, a technique developed by Parabon NanoLabs and dubbed Snapshot that creates composite images of suspects from unknown DNA found at crime scenes. The result when it comes to the Bennetts is a pair of images — one offering a likeness of a possible suspect as he looked at the time of the slaying, a second aged to approximate his appearance today — that are on view below. And Ellen Greytak, Parabon's director of bioinformatics, says a growing number of other police agencies are using Snapshot, too.